earth quake...

[shatner]

It is armor piercing, which reduces protection by 1/2, but if your original protection is >= 20 than even when halved you should suffer less-than-lethal damage far more often than not. High armor isn't 100% protection, but it's generally considered "good enough" and is often times easier to attain then something like casting "Fog Warriors" before the quake goes off.